Nalhadi A, Aida N, Ramayanti G. Usulan Perbaikan Kualitas Produk Pipa Api 5L PSL2 Menggunakan Metode Six Sigma. INTECH [Internet]. 2018Dec.30 [cited 2024Apr.26];4(2):77-5. Available from: https://e-jurnal.lppmunsera.org/index.php/INTECH/article/view/1083